So as the Title says im new to mods and probably can't even comprehend what is even out there and if my computer will even be able to run it with out crashing.

So my question is what mods, in your op, are worth getting.

I'm interested in:

quests, don't have to be voice acted but good storyline.
Weapons, I like weapons as long as the're not really OP. I also like modern weapons.
Armor, I was looking at some Halo armor mods and they look pretty cool any other suggestions?
Mods that add more/different enemies.

Any mods that you think added to your experience in a good way.